Is it normal to get sex feeling towards elder sis

hi guys today night as me and sis share the same bed, we slept as usual. we slept at 12pm around 2pm I woked up and I saw my sister cleavage visible and her naval expoased . as usual I got aroused and I cant control myself I adjusted my self nearer to her and wrapped myvarms around her exposed stomach and navel. I got hard down der slowly I started moving my hand, I acted like I was to sleepy and put my hands on the left boobs, wow what a feeling it was I thought of pressing it harder but then controlled myself other wise she must be awake. after this I removed my hand and slept in a normal position after doing this I had a hard boner , I was just wearing the boxer so the boner was visible through my boxer, after a while in sleep turned towards me and put her left leg on my thighs and her left hand on my thighs her hand was inches away from my penis suddenly her hand came over my penis and it throbed erected that was an awesum feeling ....around 15min her hand was on my penis...and it was erected all the time. if she would have moved her hand little bit I would have cum. after while she removed her hand and turned around facing her back on my side, after a while I slided my boxer down and removed my erected penis out and sticked it on her bum . that feeling was like I was really having sex... v were in that position for atleast 1/2 an hour. then I saw the time it was 4am so I got up and went to bathroom jerked off imagining what I did and then was myself and then went back to sleep.