u/bross78

Okay, so he doesn't realize at first, but as it progresses, the longer he hangs close to his friend, the more unexpectedly pleasurable it feels.

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He doesn't understand why, but he's getting hard and maybe even accidentally cumming from just being around his friend.

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Possibly mistaking it for something else and instinctively wanting more. Even he notices the changes he can't help even sneak into his friend's room at night.

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Possibly getting caught jerking off to say, his friends hanging out feet or just him sleeping in general.

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From then on, even if he wanted to get away, he's too deep. His friend knows he's hopelessly desperate for more of that feeling and uses it to his advantage as he treats your character as his new toy instead of roommate.