Shared a hotel room with my two sisters and mother after moving family friend across the state a few weeks ago. Have messed around with older sister in the past, and, made a verbal point of insisting I sleep on the floor or get a cot from the hotel, knowing such wouldn't be heard of by my sister.
"Sleep with me..I don't bite" she laughed, aware of our secret past. Other sister and mother were in other bed only a few feet away as older sister and I shared space under the covers of our bed. Both exhausted from the driving and move, yet, in a fun, away from home mood, we started up in the middle of the evening.
Reaching my hand over and cupping her marvelous 36D's inside her button-down cotton shirt (I was certain she'd worn it for my ease), I then felt her long, pink nails sink inside my shorts and issuing a light, arousing stroke. We knew s** was out of the question, however, unspokenly agreed that playing around was fine and fun.
Opening her shirt and tugging her sweatpants down, my right hand had at her body, palming her mound and pulling off a two-fingered insertion while she exhaled into the pillow. She proceeded to stroke and j*** me until I did the same breathing into my pillow. This went on between 3 and 4:30am, until we both fell asleep again.
When I woke up, her shirt remained open, and covers, on her side (thankfully facing the window) were below, exposing most of her t***. Fixing the problem, I returned to my side just before other sister's phone alarm went off. Got away with a little sis fun and nobody else knew!