DVAJ-402 Life on the edge of incest with my sister, only allowing insertion up to the first 3cm

Mitsuki was caught masturbating in VR by her brother. The virgin brother, carried away by the moment, begged to touch her breasts. Mitsuki, feeling indebted because she had borrowed money from him, accepted his request. Not only did she let him touch her breasts, but she also showed him her vagina and wanted him to touch and lick his penis… Eventually, they reached the point of almost inserting it, deciding that 'if only the tip 3cm is inserted, it doesn't count as sex,' and began to repeat glans sex. However, even just the tip moving in and out of the vagina felt incredibly good, and he gradually wanted to insert it deeper…！！