Post-s4 where Eddie and Steve get close enough that Eddie starts poking fun at Steve for wearing tighty-whities. Steve knows that they've kind of been dancing around each other for a bit, so he takes the opportunity to make a move himself.
The next time Eddie comes over, he's lounging on Steve's bed when Steve comes out of the bathroom and says "Oh, I finally got some new underwear, by the way. Since you thought the others were so lame."
When Eddie looks over he falls off the bed because Steve is standing in the doorway, wearing nothing but a pair of white, lace panties. Steve grins and watches Eddie scramble to right himself.
"They're still tight and white," Steve says as his hands slide down to rub over his hips, "but I think they're much better than the other ones, don't you?"
Eddie isn't able to say anything in response because his eyes are locked onto Steve's crotch, on that beautiful panty-wrapped dick, but he somehow manages to nod.
Steve tuts and motions for him to come closer. "You can't see them properly from over there, silly. Come get a better look."
He watches Eddie swallow hard, and then his dick kicks under lace as he watches Eddie start to crawl across the floor. His face almost reverent when he finally places his hands on Steve's thighs, his voice rough as he gives a soft "Please..."