What are the effects of magical energy when applied to the genital areas of a foal. Specific? Maybe. Just go with it.
 
I’ve been studying the electric-like effect on myself with, rather excellent results! However, the question mentioned above arose when my student Sweetie Belle entered her estrus cycle this month. As far as I know, she is not sexually active and hasn’t fully mastered her magical skills. So I wondered how the spell would affect a pony who is not active. A virgin, so to speak.
 
To answer this, I offered to assist her in her heat by trying the magical stimulation spell as an experiment. She was hesitant at first but then gladly a-accepted the offerrr-(oh gosh%!). W-within mmminutes of starting and p-pah%… p-penetrating her vaginal cavityyy, she e-exhibited instant gratisfacationin-hnnn%… Aand I was surprised to n-notice that sh-she mirrored the spell and performed it on m-myself just n-nowww! AAhh%! A-another effffect of the s-spell seems to be t-the exaaaah%… exaggeration of her b-bodily discharge%. In o-other words, she’s squ-squirting at o-orgasmm. I’d have t-to test whether this is t-the spell at workkk or if it’s naaahtural%! Hnnnnngg%!!

imported from https://derpibooru.org/images/974119