Your Sisters Impregnation Fantasy

Mom and dad aren't around and I want to get into your bed... so I do! I have to talk to you about something.. We've been doing this for a while and I love it... but its just not scratching my itch anymore.. so I ask if you can give me more... more of you! I want to really feel my brother inside me. Unprotected! It would just be really really bad if I actually got pregnant bc my body would change and people would know and we'd have to move far away.....