x1 (agent) inserts/interposes/puts/deposits x2 into interior x3/into among/between members of x3.
Insertion need not imply a significant degree of 'filling'; inject (= je'erse'a); syringe/needle (= se'arterje'e, je'erse'atci, jestu'u or tu'urjesni); also pour, inflate, stuff, fill. See also rinci, tisna, punji, jbini, nenri, jmina, culno, kunti, catlu.