.you're so big..." Becky panted. Mark just continued to grunt, and started thrusting harder. Becky bounced up and down, her tits bouncing wildly, her ...onytail swishing back and forth. Oh! OH! Oh, God, feels so good...so good..." I was paralyzed with confusion and anger.I didn't know what to do, so I just stood there and watched my roommate fucking my girlfriend. After a few minutes, Becky started moaning louder and louder. "Oh, yes, YES! Oh, God, I'm cumming again! Oh! OH! YES! So good! SO. The two girls were a little shaken; the taller of the two checking the smaller prettier one over, to ensure she was ok. She then turned and thanked me.“None of my business I know, but what was that all about?” The taller one half smiled and looked a tad sheepish, she was thin and quite shapely, but her face was a little angular; nothing like as pretty as the petite redhead who accompanied her.“Oh, never mind; he’s just an estranged ‘friend’ who seem to think we still owe him something; can’t. She was shocked especially when she saw my rock hard dick. And I couldn't help but smile as she stared at it while I dressed. Once I had my boxers on and it was gone THEN she started to change. It was hot. She liked my cock but still fought against it. But she must have been caving because she started to change in front of ME! She didn't get naked leaving her bra and underwear on as she changed. God she looked beautiful.We went out to the bar and grill on the beach and had a lot of fun. We had. He reached over and cupped my breast, alternately squeezing one then the other while he continued to fuck me. I felt him getting bigger as my pussy tightened around him. We were both about to cum, I knew it. I locked my feet behind him and helped push him harder while his hands were now both on my tits squeezing them as he exploded first then me. He was buried to the hilt inside me and I thought he’d pull out right away, but after he was done depositing his seed in me he began to move once.