Kourtney Kardashian Younes Plays Dad With Her Son, Reign

6/30/2018 12:21 PM PDT

Younes Bendjima Plays Dad with Kourtney Kardashian's Son in Italy

Kourtney Kardashian and Younes Bendjima are continuing their vacation overseas, and her children have joined them ... so Kourt's 24-year-old boyfriend is taking on some daddy duties.

The couple was spotted out on a boat in Portofino, Italy Saturday with Kourt's 3-year-old son Reign -- her youngest of 3 kids with Scott Disick -- and Younes looks pretty natural in the role of protective parent.

As we reported ... Younes and Kourtney were on a private boat last week in Capri -- just the 2 of them -- showing off their hot bods while soaking up the sun.

Parenting might not be as sexy ... but they still look good doing it.