Lullabies

So three weeks ago..... I was putting Peyton down for his nap.  I asked him what song he wanted me to sing him that day and he made his tractor sound (he can't say tractor yet but he can make the tractor sound)  Tractor song????  Well, the one and only song that popped in my head was, "She thinks my tractor's sexy."  So I sang it to him, anddddd he loved it. 

Every single naptime and now for when he goes to bed at night as well is preceded with , "She thinks my tractor's sexy."  I try to sing him something else and he'll keep interrupting me with his tractor sounds.  And it puts him right to sleep.

So if anyone has any suggestions of words to substitute, "sexy" ...... that would be great.