Do read my blog navagrahastro.blogspot.in which contains the scientific evaluation of synastry given the date, time and place of birth of both the boy and girl as per any system of Astrology be it Vedic or Western.
From what i learned from your post is that, Your boy friend’s ascendant is Aries and You are Leo. Both Fiery signs, Egotistical signs. I have read that two fiery signs are not compatible in terms of Progeny. Pluto is a far, cold and dark planet. It don’t think it will affect in anyway.