My pregnant sister has been in bed recently with morning sickness, so I decided to bring her some tomatoes. When I entered her room, I found her sleeping in an indecent state without a blanket, which made me aroused and I started using her as a masturbation aid. Then, she woke up and the atmosphere became awkward. Then, as if she was short of breath, she said to me, "I'll help you, so you'll feel better and we'll pretend this never happened!"