Description: Two persons standing next to each other. The one colored pink is labeled as “Transfems”, the one in blue is labeled “Transmascs”. The two of them are high-fiving under the label “Oh my God! Don’t use duct tape for that.”
I could not find the original source. Sorry. ☹️
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.