Seyed Ali Shobayri, Seyed Ali Shobayri is of mixed Iranian and Scottish descent who found the path of the Ahlul Bayt (a) by his own research. He holds a BA in Islamic Studies from Middlesex University through the... Answered 1 year ago

Bismillah, 

Asalamu Alaykom, 

The action itself is sinful even if ejaculation isn’t reached however it is ejaculation which would break the fast. 

May Allah grant you success