Interlocking

[Little_Girl]

A situation for a couple(man/woman), in which the woman, procures a [double sided dildo]. Preferably one with a good amount of give. The process involves locking ones genitalia, and then the double sided dildo is placed within both [buttholes].

[Monty]

(of two or more things) having parts that overlap or fit together.

[exinilu]

firmly joined together, especially by one part fitting into another: