echoing the rest to say no, cause yeonwoo is an adult who can consent and taehwan has no authority over him. furthermore taehwan doesnt know about yeonwoo's feelings, he wasnt confessed to. he was assaulted in his sleep. and then again while yeonwoo was drunk. from taehwan's pov. yeonwoo is just horny and specifically wants sex with taehwan. that's not the same as "this widdle boy is in love so i shall use him for teh sex!!" cause i mean...taehwan is popular and considered good looking by everyone he meets. he doesnt have to look far for a sex partner or a blow job. this is obviously more personal than that.
Dont get mad at me guys but what would this be considered as like rape or abusing or taking advantage of his feelings for him?