It started as text messages while studying:
Her: Hey, are you still working?
Him: Of course I am, but it's obvious that you're not.
Her: I am. But you crossed my mind, so I wanted to tell you that you're hottest when you're earning As. Lol.
Him: Yep, the best girls do it with their brain.
It escalated to his hand on her thigh under the table while they both had their books open on the tabletop.
At its best they study in the same room, because it never fails that during midterms and finals, they'll accidentally meet glances at the same time, gesture toward the bedroom, have a quickie, and return to their studies - her in his shirt and socks, him in his underwear and t-shirt, both of them prepared to focus for at least a few more hours.
That's what love looks like.