¡Mi hermanastra que vivía sola volvió de repente a la casa de mis padres! Siempre está desnuda sin que me note.

The sight of my sister in the nude was too much stimulation for me as a virgin, and of course I got a full erection! As I started to make fun of her, she took pity on me and asked me if I wanted to fuck her. I was so excited that I couldn't stand my desire.