Suso provided the through balls for Higuain's double and Jack Bonaventura strike.
“I feel like I am already part of this club, as there's a fantastic group that works hard," Pipita told Sky Sport Italia.
“We had a bit of a complicated start, but we're on the right track now and must continue like this. Milan gave me so much confidence and support from the first day and I want to repay them for that. It's also a new challenge and that fires you up.
“When I played for other teams, I'd watch Suso play and admire his quality. His second assist today was fantastic and it's thanks to my teammates that I get goals.
“Now we've got to start looking towards the derby and will try to beat Inter."