April

It had been the first time Twilight had used a forcefield that day back in October 1986 under Gabby Gums. Twilight had found that spell in a book by Starswirl the Bearded for 500 years ago in the 1300s. The Cutie Mark Crusaders could not get into Twilight's treehouse. Something that was not so visible surrounded the treehouse where the three fillies stood. The three fillies kept on petting the large, clear and sparkly bubble that was around Twilight's treehouse  Sweetie Belle kept on rubbing her itchy horn against the squeeing bubble, as the two other fillies was petting the soft sphere with their hooves and snouts. The ponies were nervous of the big balloon like thing, but it also itched in their privates too. Later had the fillies been rubbing their cheeks against the balloon like thing for a while. Thereafter had Apple Bloom sucked Sweetie Belle's itchy horn in over an hour. Scootaloo had then taken Sweetie Belle's horn in her mouth. The filly sucked the unicorn filly's horn in long time, until they reached their third orgasm. Then had the three ecstatic fillies kept on petting the big bubble again for some minutes, as they rubbed themselves under the legs too. The ponies felt how the soft bubble brushed against their stomach, until they reached their final climax after mating the large shiny bubble.