Steve- Dawn. He likes waking you up at dawn to watch the sunrise with him as the two of you cuddle.

Clint- Midday. The two of you found that's the best time to hang out because you're out of the morning funk but not yet super tired.

Thor- Morning. Like most people you act like a zombie in the morning and Thor thinks its funny since he's a total morning person.

Loki- Night. Both of you are practically nocturnal so you figured you'd spend that time with your boyfriend. You soon discovered that Loki is more loving at night.

Tony- Evening. During this time the pressure of work is gone so both of you can just let loose and have fun.

Bruce- Dusk. Both of you think a sunset is more beautiful than the sunrise so you make sure to pull Bruce from the lab to watch it with you. You always winds up falling asleep on him but he still enjoys it.

Pietro- Anytime. Pietro thinks that you're the best thing that's happened to him so he loves all the time he gets to spend with you. Even if you wake him up at three in the morning because you can't sleep.