My 74 (at the time) year old landlord and Psych professor in the duplex I lived in in college. He lived in one unit and he rented the other to me (long story, something happened and I had to leave the dorms my junior year and he helped me out bc we were both gay in a pretty non-inclusive school) and the way it's oriented, my unit door and patio faced the street and his door face the street, but his patio was on the backside facing a dirt lot, so he had a semblance of privacy, on top of us living in a large cul-de-sac that only had another duplex across from us and undeveloped lots that were presumably going to be more duplexes.
Not too long into living there I realized he'd take his laptop out there, play porn with no headphones in, and jerk off on his patio almost every evening (if my tv or music wasn't loud, I could hear it). I started peeking at him bc the way his chair and table were set up, you could walk around the building the opposite way and see him without him seeing you unless he turned around. It was hot tbh, he wore this worn out robe with tighty whities and despite being a twig, he had a disproportionately fucking huge cock and he'd make these adorable whimpering sounds as he jerked off.
Anyway, I worked up the nerve one day and finally said I could hear him while he's out there and his immediate two questions were "Are you going to report me?" and "Did you see anything?" and said "No, it's your property" and "Yes, I've looked", which I'm guessing surprised him.
Long story short (too late), we started jerking off together and then it eventually ended up that I'd come over to suck his cock every night and then we kinda, kinda didn't drunkenly have sex once (I could ride it a little bit, but 1) his cock was outrageously girthy and 2) he couldn't stay hard) and that following winter break, he told me he'd let me stay until that spring break rent free if I agreed to move out bc he went his entire teaching career having never hooked up with a student and now he felt bad.
There's NO way he would've ever fit into my ass, but I'd 10/10 suck his cock again. Funny enough, I'm still on his email list over 10 years later and get his Psych Dept announcements from time to time.