So for context she was drinking very much and i thougt she was still drunk and asleep.

I got in the shower but let the bathroom door Open knowing No one was Home exept my sleeping sister. So i got ready for shower and suddenly got a boner and thougt why Not mastrubate a bit to porn.

I Made quite a Lot of fapping Sounds and some moaning from the speaker. 20min. later or so im done and get somewhat dressed with a loose Boxer.

Out of a whim i decide to Check Up in her If shes still sleeping and didnt knock to not wake her Up. I Peak my head through the door and See her with her hands in her panties with a bright Red head and her Phone in her hands.

As she saw me she Pulled her Hand out but Not fast enough i still saw it. I was Kind of schocked Just Said hi your Up? and left the room.

After that i was Kind of scared but also a little Bit turned on and a bit between the Sheets.