Welcome to yaoi. The land of "nothing-is-actually-factually-accurate-in-relation-to-how-gay-relationships-and-sex-work" I dont like it here but it's all I've got. jst_ur_avr_fudanshi
i feel like recent series are generally better with the technicalities of sex but this one -
do they just... not prepare at all in this manhwa or is it implied that minjun does it himself off screen