7 year old boy trying to look up “boobs” online.

I need resources for dealing with this topic. We are pretty open about bodies and have had age appropriate “sex” conversations, including reading kids picture books about anatomy and consent. He is very into “girls” and “crushes” lately and today he searched “pictures of lady’s with boobs” on the iPad while in his room unsupervised. Since we almost exclusively allow shared or monitored screentime, I was suspicious immediately. Thanks to safe search, a time limit, and some hilarious spelling errors, he didn’t see any NSFW content. What resources or advice can you recommend to keep the convo going around here and keep us safe?