The penis, after ejaculation, mixes semen and vaginal fluid, and then becomes erect again through breast sex. This is followed by a description of a PtoO sex scene (Hitomi PPPD-781).

PtoO... is a technique where a penis covered in vaginal fluid is inserted into the vagina, followed by breast stimulation, and then penetration. After intense riding and ejaculation in Hitomi's position, the semen-covered penis is further stimulated with breast stimulation until it becomes rock hard, then ejaculated onto the breasts before being inserted into the vagina...