I'd like to imagine it happens one night after one of their bigger hockey games, like a championship round. Their team had won and went out to celebrate which, of course, results in a wicked party. A few hours in Wayne and Raj decide that they've had their fill of the post game partying and dip. They say goodnight to their teammates and then head over to Wayne's house to spend the rest of their night (Bonus: Parents aren't home for the weekend! SCORE!).
Once they're upstairs in Wayne's room the mood between them changes from energetic and hyped to a more gentle, loving tone. Compliments and praise are exchanged between each other, which leads to Raj passionately planting a kiss on Wayne. Wayne returns the kiss with equal enthusiasm and eventually a passionate make out session begins. Said make out session leads to the two of them stripping each other down as they climb into Wayne's bed.
The rest of the night involves a solid amount of skin slapping against skin, a bed frame hitting against the wall so much it for sure left some dents, and so much noise that it's a miracle the neighbors didn't call the authorities on them.
Whew! That was fun to conjure up! Have a good night, anon!