Reference: http://mufti.af.org.sa/ar/content/أفطر-بسبب-تقبيل
Question: A man invalidated his fast as he ejaculated semen having become excited after kissing his wife. Is he required to make-up the fast [for that day] as well as make an expiation, or what should he do?
Response: He is only required to make-up the fast [for that day].