This happened when I was fifteen. My parents had divorced two years earlier and dad had full custody of me since my mom had some serious drug issues. Two years after the divorce dad re-married a woman named Darlene. She and I became almost instant friends. She is very attractive, funny and very smart. Darlene is also quite sexy when she wants to be which is quite often. Short dresses/skirts, cleavage, no bra look, heels etc. She knows how to be sexy as opposed to slutty looking. Needless to say, at times I find myself looking at her in ways that I shouldn't be looking. She has been the source of more than one of my many erections. for me, even the perfume she sometimes wears smells sexy. I make a joke out of putting my nose against her neck but it's really a ruse to let me feel her skin.
Early one evening Darlene and my dad were getting ready to go out for awhile. Dad was already dressed and sipping a wine while watching TV and waiting for Darlene. I hear her calling my name and she asks me to bring her a blouse that is draped over a dining room chair. I pick up the blouse and take it to her bedroom. I knock on her door and Darlene tells me to come on in which I do. As soon as I step into the room I see Darlene with her back to me standing in front of her dresser. She is wearing only a pair of blue panties. Directly above the dresser is a large mirror and I see Darlene's reflection as clear as day. I am staring at her tits in the mirror. After a second or two I look into her face in the mirror and she is looking at me. She obviously sees me staring at her tits. Darlene turns around and walks towards me and takes the blouse out of my hand. She smiles at me and says, 'thank you.' It was only then that I came to my senses and left the room. My penis was already about three quarters hard and growing. I could think of nothing else the entire night and the minute they left the house I masturbated in the bathroom.
Since that evening Darlene has managed to display her tits to me quite a number of times in a manner similar to that first time. She acts very calm and casual about my seeing her and I don't know if she has any idea of how I react to looking at those beautiful tits and nipples. I would so love to have just one opportunity to touch them and squeeze them and put one of her puffy nipples into my mouth. She makes me crazy!