Newlyweds Kenshi and Karen are settling into their small apartment, worrying their father-in-law Tooru who frequently visits them with gifts. Initially, he comes by to support the young couple... but his desires get the better of him when he sees Karen's stunning beauty and voluptuous breasts. He transforms into a cuckold, eagerly devouring her assets whenever she returns home. This becomes a daily routine for Tooru, who waits for Karen at the doorstep every day, ready to feast on her luscious body once more.

狭いアパートで新婚生活を送る事になった健司と妻のかれん。そんな二人を心配する義父・とおるは手土産を持っては新居に来ていた。初めは若い夫婦を支える為…。しかし、美人で巨乳のかれんを見ているうちにとおるは欲望を掻き立てられていく。そして、かれんの職場まで車で迎えにいくと、とおるは「送り狼」に豹変。その溢れる乳房をしゃぶり倒すのだった。それからは毎日のようにとおるはかれんの帰りを車で待ち伏せして…。