should i consider this as a hindrance in my practice

advice solicitated:i went to a wedding to perfect my mantra recitation and help around in the vedic work say,setting the "havan-kunda" etc.at night on the last day while i was sleeping in the outhouse,my sister was sleeping beside me, well aware of this fact,was in deep sleep,in my sleep i saw an arousing dream and then in a semi awake sate put my arms around her first in a brotherly way,but then lust gripped me,but i immediately retracted my hand and then went to bed..crying...my questions are...will god forgive me for my sin....moreover i did not spill my virya(semen)but i did commit a break in Brahmachari(out of the 8 breaks)so have i lost my rank of a Brahmachari ?????please help me.....(though this queation pertains to hinduism,i feel my Buddhist brothers and sisters can help)