Spot Fei, Quan Fei, Zhu Fei,
The master in Feijian is receiving, and the residue is all over Zhubanquan
To put it simply, Tobirama has no heart, doesn't fall in love, sleeps with him if he likes him, don't fall in love with him.
Don't they always say that Tobirama is a heinous person? Just look at how much better Konoha would be without Tobirama.