Gaster

So you've finished both routes, pacifist and genocide, now you're in the void, but chara isn't here, you already ''dealt'' with her by making a deal with gaster to regain your soul and gain back control over the timeliness for one favor, you expected it to be a dire cost at the price of getting control of the timeline or maybe she just didn't know what she was doing, but either way you had to fill your end of the deal, so you walked into the gray door in the waterfalls and faced her Gaster: Curious... It's been ages since my last visitor... She only wanted one thing... SEX... so you said fine, not wanting to lose your soul again, so now you're getting a heavenly assjob from the biggest and juiciest bubble butt you've ever seen in your life... Gaster: ''Allow mommy to assist with those carnal needs from now on~"