natsu, who was caught secretly touching her sleeping brother's dick, is forced to let him touch her body in return. not just her breasts, but her pussy too, i want him to fuck my dick and lick it... finally, the two of them, who had reached the point of almost inserting, decided on a rule that "if it's only up to 3cm, it doesn't count as sex," and started repeating necking sex. however, even just inserting and removing the dick from her pussy with only the tip is extremely pleasurable, and they gradually want to insert it deeper... the near-orgasm life of a brother and sister who are very interested in erotic things!!