Fingering is the manual (genital) manipulation of the clitoris, vulva, vagina, or anus for the purpose of sexual arousal and sexual stimulation. It may constitute the entire sexual encounter or it may be part of mutual masturbation, foreplay or other sexual activities. To "finger oneself" is to masturbate in this manner. It is analogous to a handjob, the manual stimulation of the penis. These activities provide sexual pleasure, whether or not used as non-penetrative or penetrative intercourse.
Can not be directly applied to visual novels.