This character engages in the sexual act of tribadism during the story.
Tribadism is a form of non-penetrative sex in which a woman rubs her vulva against her partner's body for sexual stimulation, especially for ample stimulation of the clitoris. This may involve female-to-female genital contact or a female rubbing her vulva against her partner's thigh, stomach, buttocks, arm, or other body part (excluding the mouth). A variety of sex positions are recorded, including the missionary position.
The term is usually used in the context of lesbian sex, and originally encompassed societal beliefs about women's capability of being penetrative sexual partners.