Taking care of stepmommy

In this fantasy role-play stepson is very possessive of the stepmom. It's crossed over into feelings of attraction. He wants her to himself but she does not know. Stepmom has a date tonight. Stepson has given her a strong drink to have his way with her before another man does tonight. Stepmom talks about her upcoming date. She wants his opinion on outfits. Suddenly stepmom gets very groggy, losing strength & can hardly stand. She questions her stepson as she's falling all over herself. Her tits pop out & sees her stepson unzip his pants. She's in shock and says to stop. She tries desperately to stay awake! What's he going to do to her!??