It's omegaverse and often they have these. But this one is... Heh .. :( I came across some raws... Kid ML does forced himself over the young and drugged protagonist. It briefly mentioned but stated he kept doing it for years. My point is: they showed it in a 5-4 pages not entire volume. Near the end there's another r*pe scene. So yeah if it's triggering don't... I recommend checking recent omegaverse stories. Lately they been avoinding r*pe scenes
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So I read up to chapter 10 of the spanish translation and this stuff gets kind of messed up real fast but honestly I should have expected no less from the seme given his attitude in the first 3 chapters. The seme had been drugging the uke and raping him while he was unconscious since they were 13 years old. He also knew the whole time that the uke had been going out and sleeping with a bunch of alphas that looked like him while acting like an omega. Then after revealing this info he proceeded to imprison and rape the uke a whole bunch of times, then after the uke kept begging him to let him go he came up with this weird "act like my lover for a week and if I lose you can return to being my butler" bet, was shocked when he lost, then after everything returned back to normal, he threw a hissy fit about the uke winning and left the mansion for a long period of time. Uke was sad he got "abandoned," followed these shady people to a random place and got drugged with a heat inducing drug for betas, seme found him and now they have a whole bunch of sex.
Its so messed up idk where the author is planning to take the story from here.