Holy shit, he went for the classic cuck response, which is normally a terrible D-tier argument against anyone with two braincells. However, since the opponent is Traumatized-FuckedUp-Unhinged-SexAddict-Crazybitch Sister and since he really didn't start dating The Slut-GirlTM yet, it doesn't catagorally make him a cuck and instead inflicts "Re-think your world view" levels of damage on the Slut-Bitch-Sister.
How will this battle continue to play out. Will BitchFuck-Sister continue to warp her inner logic to make him the villain? Will his sheer power of good-faith love to D-tier trash woman overpower the Sister inner blockings? Will we get a classic Trauma-flashback-recontextualizes-previously-unssuferable-character-to-be-sympathetic chapter?
Find out on the next episode of Dragon Sisters Sex Z or whatever the fuck we can call this dumpster!