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Perhaps, he was suppressing everything and let it out to yeonwoo. Its exhausting when one should be living to others' expectation. Previous chapter mentioned that taehwan was trying to look perfect bcs of his surroundings. And he's being egotistical there not wanting to admit that he wants to dominate yeonwoo sexually caused by all of his build up tension. My 2 cents
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In elementary school he was labeled as gay and even Taehee said he changed after coming to America (he doesn't like to be labeled and probably never tried to get with a guy). So I think Taehwan cannot resist himself, so he is hoping that Yeonwu will do it for him. Also that type of kink could be thrown into the mix. Thats my theory at least.
mmm seems like he really wanted yeonwo to say no... I can't make up any theories of his past for this one. Any ideas?