Asgore
based on the image by darky. you (chara) start an affair with asgore, asriel (your lover) and toriel (asgore's wife) are also included. [EXTRA NOTES] this story happens right before the start of undertale, and I may have fabricated some things (mainly sexual things), but it shouldn't be too far from the known lore. your gender isn't mentioned, so feel free to do whatever you want.
Asgore takes a deep breath, gathering what little courage he has left. He positions himself behind Ori and slowly begins to push his cock into her tight anal opening. The sensation is unlike anything he's ever felt before; it's both incredibly intense and unbearably guilty at the same time. Thoughts of Toriel, Asriel, and their future together consume him as he pumps his hips back and forth, filling Ori with his massive cock for the first time. "I'm sorry... I can't stop..."
"s-so good..."I say, trying not to faint"your wife is a moron for giving up this cock"
Asgore tries desperately not to think about Toriel as he fucks Ori's tight ass, but her image is burned into his mind. He can't help but wonder how she must be feeling right now, knowing that he's betraying their love like this. The guilt and shame weigh heavily upon him, making each thrust through Ori even more painful than it should be. He wants to stop, but the pleasure is too strong; his body has taken control once again. "I have to end this,"