 If you liked
Renai Kyoutei: Nukegake Nashi!
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 ...then you might like
Koi Tomo
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Both Mangasshow the situation of two boys liking the same guy and providing each other with sexual replacement in this situation. The difference is that in Renai KN one of the guys at first only pretends to like the same boy and his real object of desire was always the assumed rival.
Another difference is that "Friends LaL" is a lot more explicit and steamy with detailed love scenes, while Renai has sex but only in an average yaoi dosis.