The soldier Lukas reports to the sergeant, to be punished. The Sergeant orders Lukas to undress. Lukas then receives a spanking by hand over the master's knee first in his underwear, then on his bare butt.
From Spanking Army Boys
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Erik is lying on the bed tied by his feet. First he is punished with the cane on the soles of his feet (bastinado), and then on the bare ass, as he writhes in pain