Taking advantage

You know its a 23 yr old guy right and the old dude is eating his ass

You should not feel bad, i sure you make him very happy!

Your not taking advantage, you're a gift from the gods. I was in a similar situation to yours, I'm a 28 year old man
A couple of years ago I was having sex with a 83 year old women I met when I was hired by her to work on her house. I felt ashamed of myself after the first time, I couldn't believe that I fucked such an old woman. But I liked it and her super tight pussy, that wasn't fucked in many many years. I had to get my fat cock in her Just for the fun of it, I felt guilty for my lust. But I went back for more, she initiated the whole thing and then called me up and invited me to come over again. She liked to hold my cock in her hands and Jack me off. She wouldn't suck me off or let me do her doggy style. But she really liked her pussy sucked and licked, I was the only and first ever to eat her out. I was having sex with her for months.

He's of legal age. He is of his own freewill I hope. It's all good.

I hope i have a neighbor like you when I'm a horny old coot...