@madboy123 Goku in this story broke the 4th wall and is watching the porn on the real world internet. this porn almost always depicts himself and krillin being cucked. In the original continuity 18 is krillin, but in hentai-land she is usually with roshi, who is depicted as an ultimate bull.
Thus Goku is being proactive and using his godly powers to assert his alpha male status by dominating his wife sexually and threatening roshi. The entire thing is a meta joke. That is sorta lampshading how stupid it is for weak side characters to cuck literal gods