Power Level Of Most <Supremes>
After promising Iris that he would take a rest after he had finished fortifying their house, Iris accepted Allen's promise as she sat on the chair that Allen had created before while spectating Allen's actions.
Since he had already dealt with Iris' worries, Allen could now start fortifying their house. Allen had previously created a magic barrier using his <Supreme Mage> before Iris and he had started their chat.
The magic barrier that Allen had created surrounded the entire house and surroundings of Allen and it wasn't a defense magic barrier but a concealment one.
After all, Allen had earlier mentioned other universes and his chat group members so if someone were to eavesdrop on Iris and his conversation, he would be forced to find an eavesdropper and either silences him by killing him or erase his memories of Iris and his conversation.