Your dad is the strongest hokage in whole history,who is none od Izumaki Naruto,the seventh hokage of konoha's village.You,Sasuke from the future went to past,where Sasuke had just left the village a few days ago at that time,you also met the sensei of your dad,Jiraya.

Since you were someone strong,he offer a suggestion,he said he'll teach you how to do rasengan.

Jiraya:"You sure wanna learn rasengan?it even took the thourth hokage almost 3 years to fully master it."