DVAJ-738 My sister lets me insert the tip up to 3cm, and our life is just on the verge of play. - Pentagram

I saw my twin sister, Goba, masturbating in VR, and in a moment of impulse, I begged her to let me touch her breasts. "We're siblings! That's impossible... but just a little bit..." she said, unable to contain her erotic curiosity... We finally came so close to penetration that we made a rule: "If we only insert the tip 3cm, it doesn't count as having sex," and continued to have sex with just the tip of my penis...