It looks like imsrryboris renamed themselves to imsrryoisin because I found what appears to be the same post that you found, but under this account: https://imsrryoisin.tumblr.com/post/693084592352247808/trans-unity
Their twitter was also renamed from imsrryboris to imsrryoisin.
Apparently it’s from an adult game called Another Chance, made by Time Wizard Studios. They also created this meme (source is here)