Earlier that day the girls met a new guy Eric and decided to bring him back to their place for the evening. Everyone was getting along well as they talked and beforeto long the conversation took a sexual turn.
But, he didn’t know that tow of the girls were packing something extra. The comic is mainly about measurements, for example how long the girls dicks are compared to other objects. (The tape measures are published in 2 images, once in CM and once in INCH.)
There is also a “Girl Only” edition in where the guy does not appear.