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Jasper was on his way to Bella's house, as he had promised Edward that he would keep an eye on Bella while he went hunting. Since Bella was still human, Jasper made sure to consume plenty of blood before going to her place, having fed on three mountain lions and two deer. As he arrived at Bella's house, he was greeted by Edward jumping out of her window, having heard him coming.
“Thank you for doing this favour for me, it means a lot to me. Bella is already dressed in her pyjamas, so no need to worry about her needing to change her clothes. As for Charlie, he's watching sports on the television, which is downstairs in the living room. He sometimes likes to check up on Bella, so listen out for that and make sure to hide so you don't get caught.” Edward quickly hugged his brother and made sure that he had all of the relevant information.
“No problem, I'm sure that I can manage just fine.” Jasper's southern drawl had a light tone of amusement at how worried his brother was, but he hugged back and reassured Edward that everything would be fine.
Edward simply gave him a short nod, then took off into the woods to go hunt, as his eyes were incredibly dark from thirst. Jasper watched his brother take off, then carefully jumped up and climbed inside through Bella's window, trying not to surprise her. As he stepped into her bedroom, he noticed how uncomfortable she looked and sensed a faint feeling of fear radiating from her.
“Don't worry, Bella, I fed before comin’ over. Look at my eyes, they're gold.” Jasper pointed to his eyes, which were indeed a light shade of topaz. In fact, his eyes were almost yellow, which meant that he had gorged himself and was full.
“Oh, that's perfect.” Bella visibly relaxed a little and motioned for him to sit at the foot of her bed, which he promptly did. “Since Edward isn’t here, maybe I could ask you something about vampirism.”
Jasper hadn't expected Bella to spring that on him, but he nodded and motioned for her to continue. He then realised that he needed to pee, but he figured that he could wait until Bella asked her question and got her answer. He tried not to think about his sudden urge, focusing on helping his brother's girlfriend.
“I just wanted to know what being thirsty felt like, so I can mentally prepare for when I get turned.”
Oh. That was absolutely not what Jasper thought she was going to ask, but he figured that he could give her an honest answer. “It feels like my throat is constantly burning, almost like having acid or lava at the back of my throat. Drinking blood helps quench that feeling, but it's only temporary, the burning feeling returns fairly quickly after feeding. Animal blood doesn't nearly quench thirst as much as human blood does, but it does keep the thirst somewhat at bay.”
Bella simply nodded at Jasper's explanation, not inquiring any further. She didn't really know what else to talk about, but she didn't exactly want to sleep yet either, as she wanted to wait for Edward to come back. The sudden silence was a little awkward, but Bella did happen to notice that Jasper looked a little uncomfortable. She then wondered if the smell of her blood was making him feel a little thirsty.
Jasper shifted a little on the bed, trying to get more comfortable. He hadn’t had a chance to use the bathroom after his hunt and he quickly noticed that his bladder was filling up rather rapidly, which made him feel a little nervous as he had no idea how long Edward would be out hunting for. He tried to subtly squeeze his thighs together and ignore the pressure building up in his lower abdomen. His left hand absentmindedly rested over his bladder, massaging it gently.
It didn't take Bella more than a minute to figure out what was wrong with Jasper. “Oh, we have a bathroom right down the hallway. It's not very fancy, but I'm sure it'll do.”
Jasper chuckled awkwardly, feeling embarrassed that she caught on to his need. “I'm sure the bathroom is fine, but I can't risk your dad seein’ me. I guess I just gotta wait ‘til my brother gets back.”
The both of them kept talking for about fifteen minutes, bonding over their shared taste in books and rock music. By that point, it was fairly obvious that Jasper was struggling to hold it in. His legs were bouncing and he couldn't sit still, fidgeting in place at the foot of Bella's bed. He still had his legs pressed together, trying to keep his mind off his achingly full bladder.
Another ten minutes of talking took place before Jasper crossed his legs. He had both of his hands massaging his bladder, which was sticking out quite a bit. The waistband of his jeans was digging into his lower abdomen and making him feel even more desperate. He kept trying to make conversation with Bella, hoping to distract himself.
“Jasper, you look like you're about to wet yourself. I promise that you can use our bathroom without any problems.” Bella felt a little bad for her boyfriend's brother. She didn't want him to be uncomfortable, especially since it was difficult enough for him to manage his thirst.
Before Jasper could argue with her, there was a knock on her bedroom door, probably from Charlie. Bella motioned towards her closet and Jasper quickly stood up, making his way there to hide, using his vampire speed. He got inside and closed the door behind him, then shoved his left hand between his legs since he now had a little bit of privacy.
Bella quickly got under the covers, hoping that Charlie wouldn't get too suspicious. “Come in, dad.”
Charlie opened the door and came inside his daughter's bedroom. He then walked over to her bed and took a seat. “I came up here to tell you goodnight.”
“Goodnight, dad.”
“Well, not so fast. We need to talk first…”
Great. Jasper had to listen to Bella receive some weird pep talk from Charlie, while being stuck inside her closet with his bladder that was about to burst. He bit his lip and crossed his legs tightly, trying his absolute best to wait until Charlie went back downstairs. The pep talk went on for a few minutes, which was dragging on forever. Jasper ended up accidentally leaking into his boxers, wetting them a decent amount, which prompted him to quickly shove his other hand between his legs and squeeze his crotch.
As Charlie continued yapping to Bella, Jasper was fighting to not lose control of his bladder. Another leak escaped, forming a wet spot on the crotch of his jeans. He was silently praying for Bella's dad to leave as he knew that he was about to wet himself at any given minute. A sharp and painful bladder spasm made him quickly lose control, as a stream slowly formed, darkening his jeans in the crotch and thighs. He panicked a little and quickly moved so that he was standing on a pile of clothes, hoping to muffle the sound of his piss hitting the floor. His piss stream ran down both of his legs and into the clothes, barely making any sound other than the initial hissing sound.
“Well, that concludes our talk for tonight. I'll let you get some rest now. Goodnight.” Charlie got up from the bed and gave Bella a kiss on the forehead before leaving her bedroom and going back downstairs.
Meanwhile, Jasper's stream slowly began to taper off. Reality quickly set in when he realised that he had to tell Bella what happened. He took a deep breath and mentally prepared himself for what he was about to say. He opened the closet door and stepped out shamefully. “Bella, I had an accident. I couldn't hold it ‘til Charlie left.”
Bella couldn't even be upset with him, especially not when she saw his eyes get watery. She actually felt a little sorry for him. “It's okay, don't worry about it. I'll have Edward clean my closet while I'm asleep.”
Speaking of Edward, he had come back from his hunt and climbed in through Bella's window, only to be greeted with a very awkward situation. He looked at Bella, then at Jasper and noticed the soaking wet jeans. “I'm afraid to ask what happened while I was gone…”
“Jasper was hiding in my closet so Charlie wouldn't see him. He then ended up accidentally wetting himself. My closet will need cleaning while I sleep tonight.” Bella tried to explain the entire situation to her boyfriend, which caused him to feel bad for Jasper.
“I'm sorry, Jazz. I'll let you go home and get cleaned up now. Thank you for keeping any eye on Bella for me.” Edward gave his brother a hug, eternally grateful that he kept her safe.
“No problem. I'd do it again, she's family now.” Jasper hugged back, then pulled away. He gave Bella a polite smile and a wave. “Bye, Bella. See you around.”
“Bye, Jasper.” Bella awkwardly waved back, smiling a little.
Within seconds, Jasper was already out the window as he jumped down and landed on the ground. He quickly ran off at vampire speed, making his way home. Once he arrived home, he quietly snuck in and made his way upstairs to his and Alice's bedroom. He then got himself undressed and put his wet clothes in the laundry basket, and then went to get some clean clothes, as well as a towel. Once he had all of his things, he made his way to the adjoining bathroom to take a shower…