Milk
Milk
[Couple sitting opposed, Megan on couch reading book and Cueball a chair with a laptop.] Megan: The fact that I have breasts doesn't mean you could milk me now. I'd have to be lactating. [A beat passes.] [In the third panel, Megan's legs are not seen, probably tucked under the armchair to feel more secure.] Cueball (thinking): Oh my god she's psychic.

Megan and Cueball are sitting quietly, engaged in their own solo pursuits.  Without any preamble, Megan answers a question that has not been asked, pointing out to Cueball that he would not be able to obtain milk from her breasts right now, as she is not lactating .  Cueball is flabbergasted that she seems to have read his mind, as this was exactly what he was wondering.
Megan, like any healthy adult female mammal , is capable of producing milk from her mammary glands .  However, this facility is not always available; Megan would have to become pregnant and give birth to trigger the bodily changes that result in normal lactation.
The title text indicates that this is not proof of Megan's psychic powers, as Cueball seems quite obsessed with this particular topic, although, if you interpret it as a response to Cueball's thoughts in the last panel it could remain ambiguous.
[Couple sitting opposed, Megan on couch reading book and Cueball a chair with a laptop.] Megan: The fact that I have breasts doesn't mean you could milk me now. I'd have to be lactating. [A beat passes.] [In the third panel, Megan's legs are not seen, probably tucked under the armchair to feel more secure.] Cueball (thinking): Oh my god she's psychic.
