I dun rlly knoww and haven't read spoilers so these r just guesses,,
1. Sucking bad energy,, this is the only logical conclusion I can make up if we believe what ml says, since he brought up reverse guiding it's possible howoo is sucking residual bad energy instead of giving the esper his calming soothing energy but again, a very crazy reach
2. Lied. In a flashback we see that mls powers were uncontrollable to a point in his childhood that probably awakened his guiding ability due to shock? Of mls powers and they bonded,,, maybe i read the past chapters wrong but I don't think u can bond with a normal person? And ml implied they bonded before they met so he possibly awoke prematurely and was unable to use guiding bc ml blocked his powers by the bond so he won't guide anyone except him
3. Lied again. Maybe he did awaken recently, maybe he did bond as an adult, maybe he was a new esper but what if he lied Abt "reverse guiding" in general? What if he wasn't a reverse guide to begin with? It actually strengthens the idea that if he was lying Abt him being a reverse guide then it makes more sense Abt the bond,, this is starting to make less sense so what I'm saying is what if he lied Abt hoowwoo being a reverse guide and is actually a normal guide but can't guide anyone else bc he's already bonded to ml?? Woahhh
wait but if reverse guiding is the esper giving the energy to the guide instead of getting it, then how was ml getting all refreshed and stuff after being with mc?