 If you liked
Futari no Musuko ni Nerawareteimasu
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 ...then you might like
Oboreru Triangle
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Nearly identical plots - a weak and useless uke (who has no will of his own), is forced into being in a physical relationship with two dudes who "love" him. The two dudes also have a healthy competition between them regarding who can manage to win the affections of the uke more. Both manga have pretty art styles, which are, honestly, wasted on this train wrecks.