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"Izzy is so hot," Clary mumbles as she walks past.
Alec, who is standing next to her, sighs deeply. "I don't really want to discuss my sister's hotness."
"Fair," Clary says. "Do you think she'd go out with me?"
Alec looks like he'd rather be cleaning off demon gunk than having this conversation. He still answers Clary, though.
"Ask her," he says. "She might be open to it. She, uh, she needs someone who actually cares about her."
"Thank you," Clary says sincerely.
Then she runs off after Izzy. She stumbles her way through a love confession. She calls Izzy hot, again. But then points out everything else she likes about her, like her smile and her kindness. Judging by the way Izzy smiles and kisses Clary, that was the right thing to say.
They walk around the Institute together all day, not letting go of each other once. At some point Clary catches Alec's eye. He actually looks like he approves. Nice.
Clary focuses on Izzy again. They kiss in the training room and in the kitchen and in Izzy’s bedroom. It's perfect. Izzy is perfect. Clary can't get enough of her. She's glad she finally asked her out.