Well since you opened this up for comment and there appears to opinions on both sides I’ll add mine. This seems highly unnatural to me. I’m no conservative prude, but sex among family members just crosses a line. Understand others on the board differ and I respect their views but respectfully disagree.
As for your specific situation, if it does not seem right to you, decline. If they react badly that’s not your issue. It is theirs. If they love you and respect you, they will respect your decision. If they shame you or become angry, they are selfishly using you for their own gratification. That is not good in any relationship.
As for your specific situation, if it does not seem right to you, decline. If they react badly that’s not your issue. It is theirs. If they love you and respect you, they will respect your decision. If they shame you or become angry, they are selfishly using you for their own gratification. That is not good in any relationship.