She sets the limits

Sue finally seemed to realize that she was not ready to go too far as she said, “Well I am not going to let you touch me if that is what you are thinking. I just want to watch you. What do you care, you are going to do it anyway. I just want to watch.”

Ben held his ground as he answered her, “Yeah I am going to do it anyway, but I want to get something out of it. I can do it with you watching or not. So again, what’s in it for me?”

Sue stood in the doorway thinking, Ben could see her chewing on her bottom lip like she always did when she was thinking about something. Ben found it incredibly sexy, and he could feel his cock twitching with lust as he looked at his sister.

“How about if I let you see my tits?” She asked him finally.

Ben thought for a moment and said, “That will do it for today. Come on show them to me. I need to cum.”

Ben’s sister Sue was dark haired, with blue eyes and an athletic, lithe body that made her look taller than the 5’ 6” she was. Her tits were small, but looked very firm and Ben was always sneaking looks at her when she was bending over, or wearing low cut tops. Ben knew that she wore padded bras that made her look bigger than she was. He had gone into her room and jacked off on her bra a couple of times, and was amazed at its thick padding.

They stood their looking at each other for a moment and then Ben broke the spell by pulling down his gym shorts letting his rock hard cock free to swing out in front of him. “Now show me your tits he said to his sister as he started to slowly jack off with his hand.

Sue eyes were fixed on his cock and she did nothing until Ben snapped at her, Come on Sue do your part. Show me your tits.”

She pulled her tight Abercrombie t-shirt up and over her head leaving her standing there in her bra and short black skirt. Ben noticed how nice her legs looked and how her firm tight ass really filled out the skirt. Then she reached back and unsnapped the bra, letting it fall forward to reveal her firm tits to him. Her nipples were big and a light pink with small, tight, perfectly round areolas surrounding them. She reached up and rubbed her left nipple as she watched Ben pound his cock into his fist.

"Fuck, your tits look great," Ben moaned as he masturbated in front of his now topless sister. Fuck, just looking at them makes me wants to cum.”

Sue cupped her small breasts and asked him, “You don’t think they are too small?”

“No, I don’t,” Ben Answered quickly. “Your fucking nipples are so big and stiff. It really turns me on. It is some much better than jacking off to a picture. Fuck I’m cumming,” Ben moaned loudly as he jerked his cock into his fist and squeezed it tight as he shot his wad, shooting the long strings of cum on the same towel his had popped his nuts off on before.

Ben’s eyes were fixed on his sister’s big, stiff nipples as he got off and he asked her, “Does it feel good when you touch your nipples.” He kept pumping his cock as he finished his orgasm and he could feel it swelling, growing larger as he jacked off.