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He drives home, leaving Loki at Tonys and knowing that he can either walk home or Tony will give him a ride. He's not ready to say that he's okay with his brother dating (Are they even dating? He doesn't know.) Tony Stark. Of all the people who Loki could have been with, Darcy Lewis for example, friend of Thors old girlfriend Jane Foster, he had to choose Tony. Tony, who Thor knew far too well. He knows Tonys deep secrets, even if they aren't the closest out of the group. He knows about Tonys underlying feelings for Rogers which he'd had ever since Thor could remember. He knows about his drinking, and his occasional, but rare, smoking. He knows that he's been with more girls that appropriate for his age. But he also knows that he's never seen Tony look at anyone like he looks at Loki.
Hes known for a while now about how Tony looks at his brother, he even told Loki about it before the dance. Maybe this was Lokis way of getting back at Thor for doubting his judgement, or feeling like he's locking him a box that he can't grow or do what he wants. Thor doesn't believe he's doing that, but he could see how Loki might. Lokis always been hesitant about this type of stuff, and Thor knows he's partially to blame along with Father. He can't stop picturing the idea of Tony breaking Lokis heart. Thor doesn't believe Loki has ever been in love. Not until now, which is scary enough to think about. He doesn't know if or how he'll accept this, but he's willing to try. He's always willing to try for his brother.
When he gets home he's surprised to see Sif's car in the driveway. She normally never stops by, he's always the one who has to climb up the tree next to her bedroom window to visit her. He doesn't know how she got into the house and he really doesn't want to.
He turns off the car, getting out and going through the garage, walking into the kitchen to find Sif sitting on a counter stool drinking what looks to be an Arizona Tea.
"Thor! I was wondering when you'd be home," she said, smiling when she saw him and walking up to kiss him on the cheek. "Where have you been?"
Thor and Sif have been dating for about four months now. Sif is older though, and she just graduated. Thor still has another year of high school and doesn't want to think about what might happen at the end of the summer.
"My brother is dating Tony Stark," Thor says glumly, wrapping a lazy hand around Sifs waist. She gets a sort of deer in headlights look before she nods quickly.
"That doesn't surprise me, Thor. Even you must notice how smiliar they are. It was bound to happen eventually," Sif said, taking Thors hand and walking to the couch. "But what has you so worried?"
"Sif, he's Tony Stark. You know how he is." Thor made an effort to include Sif, Fandral, Hogun, and Volstagg, all of which are a year older but Thors family has known for years, in his group of friends. Sif and Natasha got along unsurprisingly. Hogun and Bruce were both quiet and would be quiet together. Fandral had made it his goal to get Steve drunk before he graduated, and hadn't succeeded. Volstagg just got along with everyone, being loud and boisterious and friendly. They all knew Tony, of course, as well. Tony and Fandral got along brilliantly which was also unsurprising.
"I know. But you've been telling me for months about how Tony looks at Loki. You're in over your head about how Tony looks at Loki. You need to accept that maybe it isn't bad, maybe it's perfect," Sif smiled gently, running her thumb over Thors wrist. "Trust me. Just let the pieces fall where they may. You can't tell Loki not to care about Tony. Because you might not have noticied, but I have. Loki looks at Tony that way, too."