고맙습니다!!!

I would say 사촌과 But in Korean it is important who the person is. You : female / cousin : older female 사촌언니와(or사촌언니랑) /Cousin : older male 사촌오빠와(or 사촌오빠랑) You : male / cousin : older female 사촌누나와 (or 사촌누나랑) / cousin older male 사촌형과(or 사촌형이랑) You : male or female / cousin : younger 사촌동생과( or 사촌동생이랑