アニオタの兄にコスプレ強要されて嫌々犯されるもあまりのデカチンについスッちゃう地味な妹

A plain-looking younger sister is coerced by her anime-obsessed older brother into dressing up in cosplay. When he takes advantage and penetrates her she's overwhelmed by the sheer size of his dick — and despite her reluctance, her body betrays her as she can't help but moan.