Get plenty of calcium
"Good Lord! Tell her to put them away, Prongs!"
"What? What's happened?" James ran from the kitchen to the living room, startled by Sirius' horrified cry. The sight that met his eyes made his heart melt a little, as it always did.
"Well? Do something!" Sirius' voice had developed a distinctly shrill quality to it and James looked at him confused as Lily chuckled from her seat on the sofa.
"Do something about what?"
"About all this inappropriateness!" Sirius all but squealed as he waved vaguely towards Lily with one hand, the other clamped tightly over his eyes.
"Oh, grow up, Sirius." Lily said, partly irritated, partly amused.
"Look, Lil, as much as I love you, it's like a sister, yeah? I don't want to be ogling your...assets, thank you very much." Sirius said stiffly, still averting his gaze, despite his hand dropping from his eyes.
"I'm just breast feeding, for goodness sake!"
James moved to sit next to his wife on the sofa, a hand stroking her hair as he planted a kiss on her forehead.
"I don't know what you are talking about, Padfoot; I think it's beautiful." James beamed at his family and could feel his heart swelling with joy, despite Sirius' grumbles.
"'Beautiful' Merlin's hairy arse. It's indecent bloody exposure, is what it is."