Nipples were erect in their dreams, and despite their resistance, their private parts were involuntarily moist. Late at night, the dry air reverberated with faint sighs and the lewd sounds of mingling fluids. "Brother ...... please ...... don't stick it in ......" She was attacked in her sleep and experienced the first orgasm of her life. This was a taboo act between brother and sister, one that must not be known to anyone and must not be allowed. This includes the three sisters.