As cold water was falling on us her nipples got hard quickly and as I started sucking them she started moaning.My dick got hard in that period so she ...made me remove my underwear and started blowing my dick. She was a real pro in that, she took it slowly and let it get big in her mouth. She sucked for quite some time and I also started fucking my sister’s mouth. We realized someone coming because they were talking loud. We got dressed quickly and came back.As soon as we came back to our hotel. When I carefully bit her nipple I could hear her gasp and move. I lifted my head and looked at her and made a careful 'no-no' motion with my finger, but I also made sure that I smiled at her all the time.When I finally moved closer to her pussy I could smell her arousal and when I made first contact with those beautiful moistened lips she could not control herself any more but she had a small orgasm which trembled her body all over. I stopped and looked at her."Tsk, tsk! I didn't give you a. Would you do anything else?"I slid my other hand around her waist and down, cupping one of her buttocks. "I'd like to kiss and lick this too." No! You'd kiss there?"I moved my hand right over the center of her bottom. "Yes, and stick my tongue in there and make you feel so good!" Oh... oooohhh! I... I can't... believe... you'd do... that," she stammered."Oh, yes, I would," I responded. I moved that hand up to cup her breast. "And I'd love to kiss and suckle this too." You would? You don't know. There was no one around. I guess I got a little bolder and pulled my shirt up over my breasts and walked a few feet completely exposed.”Her breathing was very ragged as she relived her experience for me.“I still can’t believe that I did that,” her breathing was quick and ragged and her nipples were as erect as I had ever seen them.“Are you ready for bed or…” I let the invitation hang there for a second.“Or what?” she asked, looking at me suspiciously.“Well, Petey looks like he could use another.