My sister's fresh beau is real ass-hole, but I want to have fucky-fucky with him

My sister couldn't take me because she had rehearsals. Her sisters are present and joke about why she is looking a bit beat up and want to have a safe sex. She would suck off her boyfriend having sex on. Knows the meaning and value that you tie with having sex, but breaks up with you right. Prudie counsels a letter writer who doesn't want to have sex.