I've always had a fetish for my wife's ass. I often masturbate before making love, caressing it, and when she wants to be a little more slutty than her usual modesty, she wears thongs that literally make me drool. Rarely, she puts them on specifically before bed and lies down with her ass up so I can jerk off standing next to her while she falls asleep. Every now and then, as she falls asleep with her ass exposed, I sit in the armchair next to the bed and tell her I feel like a voyeur, spying on her while I imagine her getting fucked in front of me. My cock explodes with powerful erections, and I cum by the gallon.