Two-way inflation anyone?

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Thunder Dash
Two-way inflation anyone?

When I inflate. I first do an anal inflation, which starts to hurt only after a few pumps, probably because my ab muscles are very strong and developed. After, I take in air orally to fill the top end of my stomach. In between inhaling, I wait so all the air that I took in orrally can group with the air I pumped in anally. Anyone else do this?