Original Webtoon :
Ridibooks

Hee-joo gulped. To think she'd secretly witness her own brother's friend masturbating! She never intended for it to happen. "You masturbate in front of me too." However, when Hee-joo tried to run away, Kang Geon-woo demanded that she do the same. "Ha. Fck. Even your pssy is pure white." With every splashing sound, the sour scent of her arousal splattered onto Kang Geon-woo's face as he leaned in close. Licking the juices from his lips, he pushed Hee-joo's thighs further apart. The sight of her spreading opening, as if gasping, looked like it was crying out in hunger. "Ha. Are you always this lewd? Huh? Fck. Do you finger your pssy by yourself like this every day? Huh?" "Haeu, eu-eung! Heut." "Haa.... For someone so small, why are you so wet? Your juices are flowing endlessly."